碱性染料杂多酸多元配合物显色反应的研究——Ⅵ.丁基罗丹明B-砷钼杂多酸-聚乙烯醇-124体系  

Study on the Colour Reaction of the Multicomponent Complexes of Heteropolyacids With Basic Dyes Ⅵ.Butyl Rhodamine B-Heteropolymolybdoarsenic Acid-PVA-124 System

作　　者：张红琴[1] 许生杰 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《分析化学》1990年第8期710-714,共5页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金资助课题

摘　　要：本文研究了丁基罗丹明B-砷钼杂多酸-PVA-124体系,由于形成高取代氢原子的杂多酸而使反应灵敏度大增,ε值高达6.9×10~5 L·mol^(-1)·cm^(-1)。缔合物的组成比As(V):BRB=1:7。红外光谱研究证明,染料和杂多酸形成了离子对缔合物。本法可成功地用于水样和试剂中痕量砷的测定。测定下限分别为2.0ppb(水样)和2×10^(-6)％(试剂)。A new sensitive colour system of butyl rhodamine B (BRB)-molybdoarsenic acidPVA-124 has been studied. The optimum conditions for the determination of arsenic are estimated as [HNO_3]=0. 14mol/L,〔MoO_4^(2-)〕=7×10^(-4)mol/L,[BRB^+]=6. 4×10^(-6)mol/L and 0. 12% PVA-124. The ion-associate exhibits maximum absorptivity at 590nm, the apparent molar absorptivity is 6. 9×10^(-5)L. mol^(-1). cm^(-1)at 590nm. Beer＇s iaw is obeyed in the range of 0 to 1.3μg/25ml for As(V).The colour of the aqueous solution was stable at least lh. The molar ratio of As(V) to BRB^+ in ion-associate was established to be 1: 7. Intrared spectra studies show that an ionic bond occurs between BRB^+ and arsenicmolybdate and that the structure of the dye molecule is not effected by the formation of the ion-associate. After separation and concentration by hy dride generation, arsenic in water and some chemical reagents can be determined at ppb level by the proposed method with satisfactory results.

关 键 词：砷钼杂多酸 丁基罗丹明B 

分 类 号：O657.32[理学—分析化学]